94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
// Adapted from gogo/protobuf to use multiformats/go-varint for
|
|
// efficient, interoperable length-prefixing.
|
|
//
|
|
// # Protocol Buffers for Go with Gadgets
|
|
//
|
|
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
|
|
// http://github.com/gogo/protobuf
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// - Redistributions of source code must retain the above copyright
|
|
//
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// - Redistributions in binary form must reproduce the above
|
|
//
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
package pbio
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"runtime/debug"
|
|
|
|
"google.golang.org/protobuf/proto"
|
|
|
|
"github.com/multiformats/go-varint"
|
|
)
|
|
|
|
type uvarintReader struct {
|
|
r *bufio.Reader
|
|
buf []byte
|
|
maxSize int
|
|
closer io.Closer
|
|
}
|
|
|
|
func NewDelimitedReader(r io.Reader, maxSize int) ReadCloser {
|
|
var closer io.Closer
|
|
if c, ok := r.(io.Closer); ok {
|
|
closer = c
|
|
}
|
|
return &uvarintReader{bufio.NewReader(r), nil, maxSize, closer}
|
|
}
|
|
|
|
func (ur *uvarintReader) ReadMsg(msg proto.Message) (err error) {
|
|
defer func() {
|
|
if rerr := recover(); rerr != nil {
|
|
fmt.Fprintf(os.Stderr, "caught panic: %s\n%s\n", rerr, debug.Stack())
|
|
err = fmt.Errorf("panic reading message: %s", rerr)
|
|
}
|
|
}()
|
|
|
|
length64, err := varint.ReadUvarint(ur.r)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
length := int(length64)
|
|
if length < 0 || length > ur.maxSize {
|
|
return io.ErrShortBuffer
|
|
}
|
|
if len(ur.buf) < length {
|
|
ur.buf = make([]byte, length)
|
|
}
|
|
buf := ur.buf[:length]
|
|
if _, err := io.ReadFull(ur.r, buf); err != nil {
|
|
return err
|
|
}
|
|
return proto.Unmarshal(buf, msg)
|
|
}
|
|
|
|
func (ur *uvarintReader) Close() error {
|
|
if ur.closer != nil {
|
|
return ur.closer.Close()
|
|
}
|
|
return nil
|
|
}
|